<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>展示cookie</title>

    <script type="text/javascript">
        function show(){
            if (document.cookie.length > 0){
                alert(document.cookie);
                // var mycookie = getCookie('user');
                // alert("mycookie:"+mycookie);
            } else {
                alert("cookie 还未设置!");
            }
        }

        function getCookie(c_name)
        {
            if (document.cookie.length>0)
            {
                c_start=document.cookie.indexOf(c_name + "=");
                if (c_start!=-1)
                {
                    c_start=c_start + c_name.length+1;
                    c_end=document.cookie.indexOf(";",c_start);
                    if (c_end==-1) c_end=document.cookie.length;
                    return unescape(document.cookie.substring(c_start,c_end));
                }
            }
            return "";
        }
    </script>
</head>
<body>

<form action="myCookie.php" method="post">
    Name: <input type="text" name="name"><br>
    E-mail: <input type="text" name="email"><br>
    <input type="submit">
</form>

<button type="button" onclick="show()">展示内容</button>

</body>
</html>